OK, here is a layout question. I would like to lay out single.php such that:

The content of the blog post is full width under the header, and
Below the full width content is a sidebar on the left, and the comments for the post in the space to the right of the sidebar.

Put another way: a sidebar-content layout, but the blog post content goes above #content-sidebar-wrap, making it full screen. Then the sidebar is used as a sidebar, and the #content area is used for comments only.